在iphone的tableview中隐藏自定义标题

Question

我在类别表视图中使用自定义标题。所以，根据这个条件，我必须隐藏标题和它的细节。所以，我使用以下代码来显示带条件的标题。

- (UIView *) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *aView =[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 30)];

    if(section==0)
    {

        if(![appDelegate.purchase_requisitions_preference isEqualToString:@"0"] && ![appDelegate.purchase_requisitions_preference isEqualToString:@"null"])
        {
            UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];
            [btn setFrame:CGRectMake(0, 0, 320, 30)];
            btn.backgroundColor = [UIColor colorWithRed:39.0/255.0 green:131.0/255.0 blue:33.0/255.0 alpha:1.0f];
            [btn setTag:section+1];
            UILabel *label1  =  [[UILabel alloc]init];
            label1.frame     =  CGRectMake(20, 0, 320, 30);
            label1.backgroundColor = [UIColor clearColor];
            label1.textColor = [UIColor whiteColor];
            label1.font = [UIFont boldSystemFontOfSize:16];
            label1.text = @"Purchase Order Requisitions";
            [label1 setTag:section+1];
            [btn addSubview:label1];
            [aView addSubview:btn];
            [btn addTarget:self action:@selector(sectionTapped:) forControlEvents:UIControlEventTouchDown];
        }
        else
        {
            return nil;
        }

    }
    else if(section==1)
    {
        if(![appDelegate.hr_vacancies_preference isEqualToString:@"0"] && ![appDelegate.hr_vacancies_preference isEqualToString:@"null"])
        {
            UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];
            [btn setFrame:CGRectMake(0, 0, 320, 30)];
            btn.backgroundColor = [UIColor colorWithRed:39.0/255.0 green:131.0/255.0 blue:33.0/255.0 alpha:1.0f];
            [btn setTag:section+1];
            UILabel *label1  =  [[UILabel alloc]init];
            label1.frame     =  CGRectMake(20, 0, 320, 30);
            label1.backgroundColor = [UIColor clearColor];
            label1.textColor = [UIColor whiteColor];
            label1.font = [UIFont boldSystemFontOfSize:16];
            label1.text = @"Human Resource Vacancies";
            [label1 setTag:section+1];
            [btn addSubview:label1];
            [aView addSubview:btn];
            [btn addTarget:self action:@selector(sectionTapped:) forControlEvents:UIControlEventTouchDown];
        }
        else
        {
            return nil;
        }

    }
    else  if(section==2)
    {
        if(![appDelegate.hr_offers_preference isEqualToString:@"0"] && ![appDelegate.hr_offers_preference isEqualToString:@"null"])
        {
            NSLog(@"in offer");
            UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];
            [btn setFrame:CGRectMake(0, 0, 320, 30)];
            btn.backgroundColor = [UIColor colorWithRed:39.0/255.0 green:131.0/255.0 blue:33.0/255.0 alpha:1.0f];
            [btn setTag:section+1];
            UILabel *label1  =  [[UILabel alloc]init];
            label1.frame     =  CGRectMake(20, 0, 320, 30);
            label1.backgroundColor = [UIColor clearColor];
            label1.textColor = [UIColor whiteColor];
            label1.font = [UIFont boldSystemFontOfSize:16];
            label1.text = @"Human Resource Job Offers";
            [label1 setTag:section+1];
            [btn addSubview:label1];
            [aView addSubview:btn];
            [btn addTarget:self action:@selector(sectionTapped:) forControlEvents:UIControlEventTouchDown];
        }
        else
        {
            return nil;
        }
    }
    return aView;
}

如果我的条件是false，那么我想隐藏我的标题以及它的细节。它的细节被隐藏了，但标题仍然显示在那里。

Answer 1

heightForHeaderInSection:方法中的return 0，如果您的Data为nil，则返回30（只是示例），如下所示。。

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    if(section==0)
    {
        if(![appDelegate.purchase_requisitions_preference isEqualToString:@"0"] && ![appDelegate.purchase_requisitions_preference isEqualToString:@"null"])
        {
          return 30;// any height which you want        
        }
        else{
          return 0;
        }
    }
    // and so on
}

Answer 2

您需要设置头段高度，

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    if(section==0 | section==1 |section==2)
        return 30;
    else
        return 0;
}